Examples of com.opensymphony.xwork2.TextProvider

com.opensymphony.xwork2.TextProvider
Provides access to {@link ResourceBundle}s and their underlying text messages. Implementing classes can delegate {@link TextProviderSupport}. Messages will be searched in multiple resource bundles, starting with the one associated with this particular class (action in most cases), continuing to try the message bundle associated with each superclass as well. It will stop once a bundle is found that contains the given text. This gives a cascading style that allow global texts to be defined for an application base class.
You can override {@link LocaleProvider#getLocale()} to change the behaviour of howto choose locale for the bundles that are returned. Typically you would use the {@link LocaleProvider} interface to get the users configured locale.
When you want to use your own implementation for Struts 2 project you have to define following bean and constant in struts.xml: <bean class="org.demo.MyTextProvider" name="myTextProvider" type="com.opensymphony.xwork2.TextProvider" /> <constant name="struts.xworkTextProvider" value="myTextProvider" />
if you want to also use your implementation for framework's messages define another constant (remember to put into it all framework messages) <constant name="system" value="myTextProvider" />
Take a look on {@link com.opensymphony.xwork2.ActionSupport} for example TextProvider implemntation. @author Jason Carreira @author Rainer Hermanns @see LocaleProvider @see TextProviderSupport

        {
            Object o = iterator.next();


            if (o instanceof TextProvider)
            {
                TextProvider tp = (TextProvider) o;
                message = tp.getText(key, null, (String) null);


                break;
            }
        }

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        //try to find the format on the stack
        if (format != null) {
            format = findString(format);
        }
        if (date != null) {
            TextProvider tp = findProviderInStack();
            if (tp != null) {
                if (nice) {
                    msg = formatTime(tp, date);
                } else {
                    if (format == null) {
                        String globalFormat = null;


                        // if the format is not specified, fall back using the
                        // defined property DATETAG_PROPERTY
                        globalFormat = tp.getText(DATETAG_PROPERTY);


                        // if tp.getText can not find the property then the
                        // returned string is the same as input =
                        // DATETAG_PROPERTY
                        if (globalFormat != null

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       *
     * @return the message if found, otherwise the defaultMessage
     */
    public static String getText(String key, String defaultMessage, List<String> args, ValueStack stack) {
        String msg = null;
        TextProvider tp = null;


        for (Iterator iterator = stack.getRoot().iterator(); iterator.hasNext();) {
            Object o = iterator.next();


            if (o instanceof TextProvider) {
                tp = (TextProvider) o;
                msg = tp.getText(key, null, args, stack);


                break;
            }
        }


        if (msg == null) {
            // evaluate the defaultMesage as an OGNL expression
            msg = stack.findString(defaultMessage);
            if (msg == null) {
                // use the defaultMessage literal value
                msg = defaultMessage;
            }


            if (LOG.isWarnEnabled()) {
                if (tp != null) {
                    LOG.warn("The first TextProvider in the ValueStack ("+tp.getClass().getName()+") could not locate the message resource with key '"+key+"'");
                } else {
                    LOG.warn("Could not locate the message resource '"+key+"' as there is no TextProvider in the ValueStack.");
                }
                if (msg.equals(defaultMessage)) {
                    LOG.warn("The default value expression '"+defaultMessage+"' was evaluated and did not match a property.  The literal value '"+defaultMessage+"' will be used.");

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        //try to find the format on the stack
        if (format != null) {
            format = findString(format);
        }
        if (date != null) {
            TextProvider tp = findProviderInStack();
            if (tp != null) {
                if (nice) {
                    msg = formatTime(tp, date);
                } else {
                    if (format == null) {
                        String globalFormat = null;


                        // if the format is not specified, fall back using the
                        // defined property DATETAG_PROPERTY
                        globalFormat = tp.getText(DATETAG_PROPERTY);


                        // if tp.getText can not find the property then the
                        // returned string is the same as input =
                        // DATETAG_PROPERTY
                        if (globalFormat != null

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        //try to find the format on the stack
        if (format != null) {
            format = findString(format);
        }
        if (date != null) {
            TextProvider tp = findProviderInStack();
            if (tp != null) {
                if (nice) {
                    msg = formatTime(tp, date);
                } else {
                    if (format == null) {
                        String globalFormat = null;


                        // if the format is not specified, fall back using the
                        // defined property DATETAG_PROPERTY
                        globalFormat = tp.getText(DATETAG_PROPERTY);


                        // if tp.getText can not find the property then the
                        // returned string is the same as input =
                        // DATETAG_PROPERTY
                        if (globalFormat != null

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        return new WrapperExceptionConfig(cfg);
    }


    public void convertErrors(ActionErrors errors, Object action) {
        ValidationAware vaction = null;
        TextProvider text = null;


        if (action instanceof ValidationAware) {
            vaction = (ValidationAware)action;
        }
        if (action instanceof TextProvider) {
            text = (TextProvider)action;
        }
        // if there is no ValidationAware, it doesn't make sense to process messages
        // as there be no place to put message in
        if (vaction == null) {
            return;
        }
        for (Iterator i = errors.properties(); i.hasNext(); ) {
            String field = (String) i.next();
            for (Iterator it = errors.get(field); it.hasNext(); ) {
                ActionMessage error = (ActionMessage) it.next();
                String msg = error.getKey();
                if (error.isResource() && text != null) {
                    Object[] values = error.getValues();
                    if (values != null) {
                        msg = text.getText(error.getKey(), Arrays.asList(values));
                    } else {
                        msg = text.getText(error.getKey());
                    }
                }
                if (ActionMessages.GLOBAL_MESSAGE.equals(field)) {
                    vaction.addActionError(msg);
                } else {

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    }


    protected String getTranslationFromKey(String key)
    {
        Object action = getAction();
        TextProvider tp = getTextProvider(action);
        if (tp!=null)
        {   // Text Provider found
            String locale = getLocale(action).toString();  
            String result = tp.getText(key);
            if (result==null)
            {
                if (log.isErrorEnabled())
                    log.error("No translation found for key=[" + key + "] on page " + getPageName() + " --> locale=" + locale);
            }

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    //  ------- Singleton getInstance -------
    
    public static TextProvider getInstance(Class clazz, LocaleProvider provider)
    {
        TextProvider instance=new TextProviderActionSupport(provider);
        if (instance instanceof ResourceBundleTextProvider)
        {
            ((ResourceBundleTextProvider) instance).setClazz(clazz);
        }
        return instance;

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        // TODO: this should be done better
        ActionContext ac = ActionContext.getContext();
        Container cont = ac.getContainer();
        XWorkConverter xworkConverter = cont.getInstance(XWorkConverter.class);
        CompoundRootAccessor accessor = (CompoundRootAccessor) cont.getInstance(PropertyAccessor.class, CompoundRoot.class.getName());
        TextProvider prov = cont.getInstance(TextProvider.class, "system");
        boolean allow = "true".equals(cont.getInstance(String.class, "allowStaticMethodAccess"));
        OgnlValueStack aStack = new OgnlValueStack(xworkConverter, accessor, prov, allow);
        aStack.setOgnlUtil(cont.getInstance(OgnlUtil.class));
        aStack.setRoot(xworkConverter, accessor, this.root, allow);

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        // TODO: this should be done better
        ActionContext ac = ActionContext.getContext();
        Container cont = ac.getContainer();
        XWorkConverter xworkConverter = cont.getInstance(XWorkConverter.class);
        CompoundRootAccessor accessor = (CompoundRootAccessor) cont.getInstance(PropertyAccessor.class, CompoundRoot.class.getName());
        TextProvider prov = cont.getInstance(TextProvider.class, "system");
        boolean allow = "true".equals(cont.getInstance(String.class, "allowStaticMethodAccess"));
        OgnlValueStack aStack = new OgnlValueStack(xworkConverter, accessor, prov, allow);
        aStack.setOgnlUtil(cont.getInstance(OgnlUtil.class));
        aStack.setRoot(xworkConverter, accessor, this.root, allow);

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